OPEC's decision to cede no ground to rival producers underscored the price war in the crude market and the challenge to U.S. shale drillers. The 12-nation group abandoned its role as a swing producer, ignoring the steepest slump in oil prices since the global recession to keep its output target unchanged.

Money managers and brokers are shunning Barclays Plc’s dark pool after allegations the bank lied to clients about whether they would be dealing with high- frequency traders, according to people with knowledge of the matter.

U.S. stocks fluctuated, after the Standard & Poor’s 500 Index fell from a record, as investors assessed corporate earnings and stimulus prospects. The dollar rose to a four-month high and European shares closed at a six- year best.